getAssetsByGroup

curl --request POST \
  --url 'https://mainnet.helius-rpc.com/?api-key=' \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "id": "1",
  "method": "getAssetsByGroup",
  "params": {
    "groupKey": "collection",
    "groupValue": "J1S9H3QjnRtBbbuD4HjPV6RpRhwuk4zKbxsnCHuTgh9w"
  }
}
'

{
  "jsonrpc": "2.0",
  "result": {
    "last_indexed_slot": 365750752,
    "total": 1,
    "limit": 1,
    "page": 1,
    "items": [
      {
        "interface": "ProgrammableNFT",
        "id": "JEGruwYE13mhX2wi2MGrPmeLiVyZtbBptmVy9vG3pXRC",
        "authorities": "<array>",
        "compression": {},
        "grouping": "<array>",
        "royalty": {},
        "creators": "<array>",
        "ownership": {},
        "supply": {},
        "mutable": true,
        "burnt": false
      }
    ]
  }
}